请教LWIP DHCP使用

只看该作者 · 2018-7-4 16:54

我把STM32做成了CLIENT，使用的预先指定静态IP，这样做有些不方便。所以想用自动分配IP，想知道除了在lwipopts.h中#define LWIP_DHCP 1
#define LWIP_ARP  1
和将dhcp.h包含进相关的源文件里，还需要做其它的什么吗。DHCP是UDP协议工作的，是不是要用UDP才行。
void LwIP_Init( void )
{
  struct ip_addr ipaddr;
  struct ip_addr netmask;
  struct ip_addr gw;

/*调用LWIP初始化函数，
初始化网络接口结构体链表、内存池、pbuf结构体,启动协议栈管理进程*/
lwip_init();
#if LWIP_DHCP
  ipaddr.addr = 0;
  netmask.addr = 0;
  gw.addr = 0;
#else
  IP4_ADDR(&ipaddr, 192, 168, 0, 16);                //设置网络接口的ip地址
  IP4_ADDR(&netmask, 255, 255, 255, 0);             //子网掩码
  IP4_ADDR(&gw, 192, 168, 0, 1);  //网关
#endif

  netif_add(&enc28j60, &ipaddr, &netmask, &gw, NULL, eernetif_init, eernet_input);
  netif_set_default(&enc28j60);

#if LWIP_DHCP                                  //若使用了DHCP
  dhcp_start(&enc28j60);          //启动DHCP
#endif
  netif_set_up(&enc28j60); //使能enc28j60接口
}

void tcp_client_init(void)
{
      struct tcp_pcb* client_pcb;
      struct tcp_client_app_arg* app_arg;

      printf(&quot;tcp client inti
&quot;);

      destip.addr = (uint32_t)192+(168<<8)+(0<<16)+(105<<24);

      client_pcb = tcp_new();
      if(client_pcb != NULL)
      {
            tcp_arg(client_pcb, mem_calloc(sizeof(struct tcp_client_app_arg), 1));
            app_arg = client_pcb->callback_arg;
            app_arg->app_state = CLIENT_WAITING_FOR_CONNECTION;
            tcp_connect(client_pcb, &destip, 2200, tcp_client_connected);
      }
      else
      {

            printf(&quot;tcp alloc failed
&quot;);
      }
}

void LwIP_Periodic_Handle(__IO uint32_t localtime)
{
      if(ETH_INT == 1)
      {
               ETH_INT = 0;
                  /* Read a received packet from the Ethernet buffers and send it to the lwIP for handling */
            IN:       ethernetif_input(&enc28j60);                      //轮询是否接收到数据
      }
      if(GPIO_ReadInputDataBit(GPIOC,GPIO_Pin_2) == RESET) goto IN;

      /* TCP periodic process every 250 ms */
      if (localtime - TCPTimer >= TCP_TMR_INTERVAL)
      {
         TCPTimer =  localtime;
         tcp_tmr();                //每250ms调用一次
      }
      /* ARP periodic process every 5s */
      if (localtime - ARPTimer >= ARP_TMR_INTERVAL)
      {
         ARPTimer =  localtime;
         etharp_tmr();       //每5s调用一次
      }

#if LWIP_DHCP
      /* Fine DHCP periodic process every 500ms */
      if (localtime - DHCPfineTimer >= DHCP_FINE_TIMER_MSECS)
      {
         DHCPfineTimer =  localtime;
         dhcp_fine_tmr();
      }
      /* DHCP Coarse periodic process every 60s */
      if (localtime - DHCPcoarseTimer >= DHCP_COARSE_TIMER_MSECS)
      {
         DHCPcoarseTimer =  localtime;
         dhcp_coarse_tmr();
      }
#endif

请教LWIP DHCP使用

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